add CoupledSDEs(ds::CoupledSDEs, diffeq) method

[oameye]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 86.33%. Comparing base (6c98239) to head (a9c00ee).
Report is 39 commits behind head on main.

Files with missing lines	Patch %	Lines
ext/src/CoupledSDEs.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #231      +/-   ##
==========================================
+ Coverage   82.00%   86.33%   +4.33%     
==========================================
  Files          15       17       +2     
  Lines         717      937     +220     
==========================================
+ Hits          588      809     +221     
+ Misses        129      128       -1     

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[Datseris]

Please increase patch number in Project.toml. Most PRs should be reelased in a new version after merge.

[oameye]

Yeah sorry. I often forget.